2,398 research outputs found
New Interpretation of the 1sigmauplus and 1piu Rydberg States and Valence States of Nitrogen Below the First Ionization Limit
Interpretation of Rydberg and valence states of nitrogen below first ionization limi
Absorption Spectrum of the NO Molecule. V - Survey of Excited States and Their Interactions
High resolution absorption spectrograms of excited nitrogen oxide molecular interaction
Ionization of molecular hydrogen and deuterium by a frequency-doubled Ti:sapphire laser pulses
A theoretical study of the intense-field single ionization of molecular
hydrogen or deuterium oriented either parallel or perpendicular to a linear
polarized laser pulse (400 nm) is performed for different internuclear
separations and pulse lengths in an intensity range of W
cm. The investigation is based on a non-perturbative treatment that
solves the full time-dependent Schr\"odinger equation of both correlated
electrons within the fixed-nuclei and the dipole approximation. The results for
various internuclear separations are used to obtain the ionization yields of
molecular hydrogen and deuterium in their ground vibrational states. An atomic
model is used to identify the influence of the intrinsic diatomic two-center
character of the problem.Comment: 13 pages, 9 figure
Flavor asymmetry of polarized antiquark distributions and semi-inclusive DIS
The -expansion of QCD suggests large flavor asymmetries of the
polarized antiquark distributions in the nucleon. This is confirmed by model
calculations in the large- limit (chiral quark-soliton model), which give
sizable results for and . We compute the contributions of
these flavor asymmetries to the spin asymmetries in hadron production in
semi-inclusive deep-inelastic scattering. We show that the large flavor
asymmetries predicted by the chiral quark-soliton model are consistent with the
recent HERMES data for spin asymmetries in charged hadron production.Comment: 21 pages, LaTeX2e, 9 eps figures include
Enimies to Mankind : Convict Servitude, Authority, and Humanitarianism in the British Atlantic World
This study examines the role that British convict transportation and penal servitude in America played in the early history of humanitarianism. During the eighteenth century Britons\u27 and Americans\u27 ideas about moral obligations and suffering changed drastically toward traditionally detested people, including transported convicts, enslaved Africans, sailors, and the poor. Historians have made it clear that people in the eighteenth century created unprecedented ways to understand the human condition, and studying coerced labor of all kinds tells scholars more about how unfreedom shaped the language, ethics, and practices of the early stages of humanitarianism. In the eighteenth century British courts banished over 50,000 convicted men, women, and children to the American colonies, many of whom were sold as convict servants. This study argues that emerging ideas of punishment, morality, and unfreedom evoked by convict labor created new moral responsibilities, widened the plane of sympathies, and inspired novel denunciations of suffering in eighteenth century Anglo-American culture. Institutional banishment and convict servitude had unintentional consequences for both Britain and America, and moralists and elites constructed a new discursive environment that raised complex questions and generated new debates about labor, coercion, and cruelty in the Age of Enlightenment and Revolution
Luminosity density estimation from redshift surveys and the mass density of the Universe
In most direct estimates of the mass density (visible or dark) of the
Universe, a central input parameter is the luminosity density of the Universe.
Here we consider the measurement of this luminosity density from red-shift
surveys, as a function of the yet undetermined characteristic scale R_H at
which the spatial distribution of visible matter tends to a well defined
homogeneity. Making the canonical assumption that the cluster mass to
luminosity ratio M/L is the universal one, we can estimate the total mass
density as a function \Omega_m(R_H,M/L). Taking the highest estimated cluster
value M/L ~300h and a conservative lower limit R_H > 20 Mpc/h, we obtain the
upper bound \Omega_m < 0.1 . We note that for values of the homogeneity scale
R_H in the range R_H ~ (90 +/- 45) hMpc, the value of \Omega_m may be
compatible with the nucleosynthesis inferred density in baryons.Comment: 16 pages, latex, no figures. To be published in Astrophysical Journal
Letter
Time-resolved spectroscopy of the excited electronic state of reaction centers of Rhodopseudomonas viridis
The spectral properties of the excited electronic state of the reaction centers of Rhodopseudomonas (Rps.) viridis are studied by dichroic transient absorption spectroscopy with sub-picosecond time resolution. The theoretical analysis of the experimental results allows the assignment of the transient absorption from two dimer bands of the special pair and show its excitonic coupling to other pigments
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